[Sheriff] Disable Flaky TouchpadPinchOverOOPIF

TBR=mcnee

Bug: 947193
Change-Id: Ibff4f4d8654092a25ed05b363338ce8e3e958e8c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2218840Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772632}

content/browser/site_per_process_hit_test_browsertest.cc

@@ -5304,7 +5304,8 @@ IN_PROC_BROWSER_TEST_F(SitePerProcessHitTestBrowserTest,
 // Test that performing a touchpad pinch over an OOPIF offers the synthetic
 // wheel events to the child and causes the page scale factor to change for
 // the main frame (given that the child did not consume the wheel).
-#if defined(OS_LINUX)
+#if defined(OS_LINUX) || defined(OS_WIN)
+// Flaky on Windows: https://crbug.com/947193
 #define MAYBE_TouchpadPinchOverOOPIF DISABLED_TouchpadPinchOverOOPIF
 #else
 #define MAYBE_TouchpadPinchOverOOPIF TouchpadPinchOverOOPIF